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Discussion Starter · #1 ·
Hey guys, I bought a set of fully assembled aluminum AFR part #1036 heads off jegs a while back and I am unsure of the spring specs. I looked on the website and all I could find is that they are assembled with dual springs but they don't list the spring rate or anything. If anybody knows the specs on these springs please let me know because right now I am unsure if I can run a hydraulic roller cam with these springs or if larger ones are needed. They are 1.290" O.D.
 

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AFR's web site shows spring #8017 as standard on head #1036. 1.290" diameter, .685" id, 135 lbs seat @ 1.800" installed ht, 340 lbs @ 1.230", 1.050" coil bind ht, 360 lbs/in rate, .600" max lift. This is the standard supplied AFR spring.

There is also a 1.290" diameter upgrade spring option, a Comp Oviate wire spring, .650" id with 150 lbs seat @ 1.74" install ht, 380 lbs @ 1.160", 1.097 coil bind ht, 397 lbs/in rate, .630" max lift. AFR # 8004.

Notes on the AFR site says that the standard spring will go into valve float with a Hyd. Roller at approximately 6000-6200 rpm because of the fast ramp rate of the roller and recommend the upgrade spring for use with them.

Don't rely on Jeg's or Summit for this kind of info, go straight to the source. Jeg's is just a middle man.
 

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Discussion Starter · #3 ·
Ok yea I have the 8017 spring it seems because they haven't been taken apart or anything. I plan on running a hydraulic roller cam but the engine will not see above 6000rpm (I'm going to install a rev limiter to make sure). Do you think there would be an issue in using the springs the head came with if the engine stays 6000rpm and under?
 
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